What happens to new oceanic crust at a mid-ocean ridge
a. it forms new mountains under the water
b. it climbs up the mantle to form a trench
c. it gets hotter and sinks into a trench
d. it is so dense that gravity pulls it into a deep-ocean trench

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.